Efficient bending-adjusting medical sheath tube

Abstract

The utility model discloses an efficient bending-adjusting medical sheathing canal which sequentially comprises an outer-layer canal, an outer braid layer, an inner braid layer and an inner-layer canal from outside to inside, a first channel part is arranged between the inner-layer canal and the inner braid layer, a second channel part is arranged between the inner braid layer and the outer braid layer, and pull wires are arranged in the first channel part and the second channel part in a penetrating mode; the outer side wall of the inner-layer pipe is further sleeved with a pull ring, the pull ring is provided with two pull wire mounting positions, a pull wire is welded and fixed to each pull wire mounting position, each pull wire mounting position comprises a first groove part, a wire penetrating channel communicated with the first groove part, a second groove part communicated with the wire penetrating channel and a containing groove communicated with the second groove part, and the first groove part and the second groove part are communicated with each other. The pull wire penetrates through the first groove part and the wire penetrating channel and is bent in the second groove part, and the end of the pull wire is located in the containing groove. The sheathing canal can achieve efficient bending adjustment.

Description

Technical Field

[0001] The present application relates to the field of medical devices, and in particular to a highly efficient bending-adjustable medical sheath. Background Art

[0002] Interventional therapy is an emerging discipline that integrates imaging diagnosis and clinical treatment. It is a technology that uses puncture needles, catheters, sheaths and other interventional equipment to introduce instruments into the lesion site of the human body through natural channels such as human blood vessels and urethra or tiny incisions for treatment. Since the sheath needs to be inserted into the human body, and needs to bend along the human blood vessels during the advancement process, and also needs to bend in the working position, so as to guide the working catheter inserted therein, the existing sheaths still have insufficient mechanical properties, and some sheaths are only provided with one pull wire, so that the direction in which the sheath can be bent is relatively single. Although the sheath can be bent in any direction by rotating it, the operation is more complicated. In addition, the existing welding of the pull wire and the pull ring has few welding points, and there is a situation where the welding is not strong enough. Therefore, there is still room for improvement in the penetration of the sheath into the human body and the bending of the end of the sheath. Utility Model Content

[0003] Purpose of the utility model: This application aims to overcome the defects of the prior art and provide a highly efficient bending medical sheath.

[0004] Technical solution: A sheath tube, comprising, from outside to inside, an outer tube, an outer braided layer, an inner braided layer and an inner tube, a first channel portion being provided between the inner tube and the inner braided layer, a second channel portion being provided between the inner braided layer and the outer braided layer, pull wires being passed through the first channel portion and the second channel portion; a pull ring is also provided on the outer side wall of the inner tube, the pull ring has two pull wire installation positions, a pull wire is welded and fixed at each pull wire installation position, the pull wire installation position comprises a first groove portion, a threading channel connected to the first groove portion, a second groove portion connected to the threading channel and a receiving groove connected to the second groove portion, the pull wire passes through the first groove portion and the threading channel, is bent at the second groove portion and the end of the pull wire is located in the receiving groove.

[0005] Furthermore, the two installation positions of the pull ring are in opposite positions.

[0006] Thus, the adjustable bending section of the sheath tube can be bent to both sides through two pull wires at opposite positions.

[0007] Furthermore, the first groove portion is close to the proximal end of the sheath tube, and the second groove portion is close to the distal end of the sheath tube; the pull ring is annular, and the accommodating groove is communicated with the outer side wall of the pull ring.

[0008] Further, the length of the first groove portion is more than five times the length of the second groove portion; the length of the receiving groove is more than one-third of the length of the pull ring.

[0009] Thus, there are more welding areas at the installation positions of the pull wire and the pull ring, and the welding is more stable.

[0010] Further, both the first channel portion and the second channel portion include a pipe portion and two wing portions located on both sides of the pipe portion.

[0011] Further, both the inner braided layer and the outer braided layer are metal braided layers.

[0012] Further, the inner layer tube is made of polytetrafluoroethylene material.

[0013] Thus, the catheter subsequently inserted into the sheath tube can move more smoothly inside the sheath tube.

[0014] Further, the outer layer tube includes a bendable section and a non-bendable section, and the hardness of the bendable section is less than the hardness of the non-bendable section.

[0015] Further, there are no inner braided layer and outer braided layer at the position where the pull ring is located, and the pull ring is located between the inner layer tube and the outer layer tube.

[0016] Beneficial effects: Since the sheath tube of the present application has an inner braided layer and an outer braided layer, the sheath tube has better mechanical properties and is more stable and safe to use;

[0017] The sheath tube of the present application has two pull wires, so that the end of the sheath tube can be bent to both sides, and thus the use of the sheath tube is more flexible;

[0018] There are more welding areas between the pull wire and the pull ring of the sheath tube of the present application, so that the welding between the pull wire and the pull ring is more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic view of the first perspective of the sheath tube;

[0020] Figure 2 is a schematic view of the second perspective of the sheath tube;

[0021] Figure 3 is a schematic view of the sheath tube when the pull wire is not shown;

[0022] Figure 4 is another schematic view of the sheath tube when the pull wire is not shown. DETAILED DESCRIPTION OF THE INVENTION

[0023] Reference numerals: 1 inner layer tube; 2 inner braided layer; 3 outer braided layer; 4 outer layer tube; 5 pull ring; 5.1 first groove portion; 5.2 wire threading channel; 5.3 second groove portion; 5.4 receiving groove; 6 pull wire; 6.1 first channel portion; 6.2 second channel portion; 6.3 pipe portion; 6.4 flank portion.

[0024] As Figures 1-4 shown, an efficient bending-adjustable medical sheath tube includes, from outside to inside in sequence, an outer layer tube 4, an outer braided layer 3, an inner braided layer 2, and an inner layer tube 1. A first channel portion 6.1 is provided between the inner layer tube 1 and the inner braided layer 2. A second channel portion 6.2 is provided between the inner braided layer 2 and the outer braided layer 3. A pull wire 6 is threaded through both the first channel portion 6.1 and the second channel portion 6.2. A pull ring 5 is further sleeved on the outer side wall of the inner layer tube 1. The pull ring 5 has two pull wire installation positions, and a pull wire 6 is fixedly welded at each pull wire installation position. The pull wire installation position includes a first groove portion 5.1, a wire threading channel 5.2 communicating with the first groove portion 5.1, a second groove portion 5.3 communicating with the wire threading channel 5.2, and a receiving groove 5.4 communicating with the second groove portion 5.3. The pull wire 6 passes through the first groove portion 5.1 and the wire threading channel 5.2, is bent in the second groove portion 5.3, and the end of the pull wire 6 is located in the receiving groove 5.4.

[0025] The first groove portion 5.1 is close to the proximal end of the sheath tube, and the second groove portion 5.3 is close to the distal end of the sheath tube. The pull ring 5 is circular, and the receiving groove 5.4 communicates with the outer side wall of the pull ring 5. The length of the first groove portion 5.1 is more than 5 times the length of the second groove portion 5.3. The length of the receiving groove 5.4 is more than one-third of the length of the pull ring 5. Both the first channel portion 6.1 and the second channel portion 6.2 include a pipe portion 6.3 and two flank portions 6.4 located on both sides of the pipe portion 6.3. Both the inner braided layer 2 and the outer braided layer 3 are metal braided layers. The inner layer tube 1 is made of polytetrafluoroethylene material. The outer layer tube 4 includes a bending-adjustable section and a non-bending-adjustable section, and the hardness of the bending-adjustable section is less than the hardness of the non-bending-adjustable section. There are no inner braided layer 2 and outer braided layer 3 at the position where the pull ring 5 is located, and the pull ring 5 is located between the inner layer tube 1 and the outer layer tube 4.

[0026] The sheath tube of the present application has two metal braided layers, namely an inner braided layer and an outer braided layer, so that the sheath tube has better mechanical properties. And the inner layer is made of polytetrafluoroethylene material, so that the catheter can move more smoothly within the sheath tube. And the present application has a first channel portion and a second channel portion. A pull wire is threaded through the pipe portions of the first and second channel portions, so that the pulling of the pull wire is more smooth. And there are two pull wires, so that the end of the sheath tube can be bent to both sides. And the first and second channel portions have pipe portions and wing portions, so that the first channel portion is better located between the inner layer tube and the inner braided layer, and the second channel portion is better located between the inner braided layer and the outer braided layer. The wing portions can well fill the space on both sides of the pipe portion. And the pull wire will be bent when welded and fixed to the pull ring, so that the pull wire is welded at the position of the first groove portion and at the position of the receiving groove, so that the welding of the pull wire and the pull ring is more stable, making the bending adjustment operation of the pull wire more stable.

[0027] Although the present utility model has been illustrated and described with respect to the preferred embodiments, those skilled in the art should understand that various changes and modifications can be made to the present utility model as long as they do not exceed the scope defined by the claims of the present utility model.

Claims

1. A highly efficient bending medical sheath, characterized in that: From the outside to the inside, it includes an outer tube, an outer braided layer, an inner braided layer and an inner tube in sequence, a first channel portion is provided between the inner tube and the inner braided layer, a second channel portion is provided between the inner braided layer and the outer braided layer, and pull wires are passed through the first channel portion and the second channel portion; a pull ring is also provided on the outer side wall of the inner tube, and the pull ring has two pull wire installation positions, a pull wire is welded and fixed at each pull wire installation position, and the pull wire installation position includes a first groove portion, a threading channel connected to the first groove portion, a second groove portion connected to the threading channel, and a receiving groove connected to the second groove portion, the pull wire passes through the first groove portion and the threading channel, is bent in the second groove portion, and the end of the pull wire is located in the receiving groove.

2. The high-efficiency bending-adjustable medical sheath according to claim 1, characterized in that: The first groove portion is close to the proximal end of the sheath tube, and the second groove portion is close to the distal end of the sheath tube; the pull ring is in a circular ring shape, and the accommodating groove is communicated with the outer side wall of the pull ring.

3. The high-efficiency bending-adjustable medical sheath according to claim 1, characterized in that: The length of the first groove portion is more than 5 times the length of the second groove portion; the length of the accommodating groove is greater than one third of the length of the pull ring.

4. The high-efficiency bending-adjustable medical sheath according to claim 1, characterized in that: The first channel portion and the second channel portion each include a pipe portion and two side wing portions located on both sides of the pipe portion.

5. The high-efficiency bending-adjustable medical sheath according to claim 1, characterized in that: The inner braided layer and the outer braided layer are both metal braided layers.

6. The high-efficiency bending-adjustable medical sheath according to claim 1, characterized in that: The inner layer tube is made of polytetrafluoroethylene material.

7. The high-efficiency bending-adjustable medical sheath according to claim 1, characterized in that: The outer tube comprises a bending adjustment section and a non-bending section, and the hardness of the bending adjustment section is smaller than the hardness of the non-bending section.

8. The high-efficiency bending-adjustable medical sheath tube according to claim 1, characterized in that: There is no inner braided layer and outer braided layer at the position where the pull ring is located, and the pull ring is located between the inner layer tube and the outer layer tube.

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